A fracturing gas production wellhead with a sealing mechanism and its usage method

Abstract

The present invention relates to the technical field of gas production wellheads, and discloses a fracturing gas production wellhead with a sealing mechanism and its usage method, including a sealing assembly. The sealing assembly includes a wellhead, a fixed sleeve plate is fixedly connected to the outer wall of the wellhead, and a sliding rod is slidably connected to the inner wall of the fixed sleeve plate. The gas sucked out by the suction device of the present invention will first enter the fixed housing five through the filtering action of the sliding filter plate and the fixed filter plate. The gas entering the fixed housing five will drive a plurality of rotating fans to rotate during the flowing process, and then drive the sliding filter plate to move together. When the rotating fans cannot rotate, the sliding filter plate will also stop moving. At this time, only a small part of the filter holes opened on the sliding filter plate will intersect with the filter holes opened on the fixed filter plate to filter the sucked gas. When the suction is no longer carried out, the torsion spring two will drive the rotating fans to reset, and the particles stuck between the sliding filter plate and the fixed filter plate will fall off to prevent blockage.

Description

Technical Field

[0001] The present invention relates to the technical field of gas production wellheads, and particularly to a fracturing gas production wellhead with a sealing mechanism and its usage method. Background Art

[0002] A fracturing gas production wellhead is an important device in the process of oil or natural gas extraction. Fracturing refers to a method in the process of oil or gas production that uses hydraulic action to form fractures in the oil and gas reservoir, also known as hydraulic fracturing. Fracturing artificially creates fractures in the formation to improve the underground flow environment of the oil, increase the production of the oil well, and plays an important role in improving the bottom-hole flow conditions of the oil well, reducing interlayer interference, and improving the utilization status of the oil reservoir.

[0003] During the process of extracting the natural gas in the well after fracturing, some impurity particles are extracted along with the natural gas, resulting in an impact on the purity of the extracted natural gas. Therefore, in view of the above problems, the following solutions are proposed. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a fracturing gas production wellhead with a sealing mechanism, including a sealing assembly. The sealing assembly includes a wellhead, a fixed sleeve plate is fixedly connected to the outer wall of the wellhead, and a sliding rod is slidably connected to the inner wall of the fixed sleeve plate;

[0005] An air intake assembly, the air intake assembly includes a first sliding plate slidably connected to the inner wall of the fixed sleeve plate, a liquid guide groove is formed inside the fixed sleeve plate, and a second fixed shell is fixedly connected to the outer wall of the fixed sleeve plate;

[0006] A filtering assembly, the filtering assembly includes a fifth fixed shell fixedly connected to the bottom of the fixed sleeve plate, a fixed frame is fixedly connected to the inner wall of the fifth fixed shell, and a rotating fan is rotatably connected to the inner wall of the fixed frame.

[0007] Preferably, a top plate is fixedly connected to the top of the sliding rod, a rotating ring is rotatably connected to the inner wall of the fixed sleeve plate, a clamping rod is rotatably connected to the rotating ring, a first coil spring is fixedly connected to the outer wall of the clamping rod, and the first coil spring is fixedly connected to the inner wall of the rotating ring at the end far from the clamping rod. A clamping plate is fixedly connected to the outer wall of the rotating ring, and a first fixed frame is fixedly connected to the bottom of the top plate. A first fixed shell is slidably connected to the outer surface of the first fixed frame. When using this device, first install this device at a designated position. Subsequently, when a fracturing device needs to be inserted into the wellhead, the top plate can be jacked up. The top plate in the figure is already in the jacked-up state, and the rotating ring is rotated so that its top contacts the bottom of the sliding rod after being jacked up, thereby keeping the top plate in the jacked-up state.

[0008] Preferably, the outer wall of the first fixed housing is fixedly connected to the inner wall of the fixed sleeve plate. A first liquid guide pipe is fixedly connected to the inner wall of the fixed sleeve plate. Two air guide blocks are respectively fixedly connected to the outer wall of the first liquid guide pipe. The outer surface of the air guide block is fixedly connected to the inner wall of the fixed sleeve plate. A sliding rod is slidably connected to the inner wall of the air guide block. At the mutually approaching ends of the two sliding rods, sealing plates are fixedly connected. The outer surface of the sealing plate is slidably connected to the inner wall of the fixed sleeve plate. During the upward movement of the top plate, the first fixed frame will be driven to move upward together. During the upward movement of the first fixed frame, the hydraulic oil in the first liquid guide pipe will be sucked into the first fixed housing. The first liquid guide pipe will suck the hydraulic oil in the air guide block into the first liquid guide pipe, thereby sucking the two sliding rods in the direction away from each other. While moving, the sliding rod will drive the sealing plate to move together, thereby exposing the feeding port. At this time, the fracturing equipment can pass through the fixed sleeve plate through the feeding port and then extend into the wellhead. After the fracturing work is completed and the fracturing equipment is taken out, the rotating ring can be rotated so that it no longer supports the sliding rod. The top plate will fall and reset due to gravity, and the first fixed frame will also reset accordingly. Therefore, the sealing plate will also reset, thereby sealing the wellhead. The rotating ring can be continuously rotated to insert a part of the clamping rod into the sliding rod, thereby limiting the sliding rod and the top plate. Through the sealing effect of the sealing plate, this design can maintain the stability of the downhole environment when the device is not in use and prevent substances outside the well from entering the well, and the operation is simple and convenient.

[0009] Preferably, a second liquid guide pipe is fixedly connected to the outer wall of the second fixed housing. The second liquid guide pipe is fixedly connected to a third fixed housing at the end far from the second fixed housing. The outer surface of the third fixed housing is fixedly connected to the outer wall of the fixed sleeve plate. A second sliding plate is slidably connected to the inner wall of the third fixed housing. A limiting rod is fixedly connected to the bottom of the second sliding plate. The outer surface of the limiting rod is slidably connected to the inner wall of the third fixed housing. The outer surface of the limiting rod is slidably connected to the outer surface of the clamping plate. A gas guide pipe is fixedly connected to the bottom of the third fixed housing. The gas guide pipe is fixedly connected to a fourth fixed housing at the end far from the third fixed housing. The outer surface of the fourth fixed housing is fixedly connected to the outer wall of the fixed sleeve plate. An adsorption sleeve is slidably connected to the inner wall of the fourth fixed housing. A first spring is fixedly connected to the bottom of the adsorption sleeve. When extracting natural gas, install the suction device above the top plate and rotate the rotating ring so that the clamping rod completely penetrates the sliding rod. At this time, the clamping plate no longer limits the limiting rod. Start the suction device, and negative pressure will be generated inside the fixed sleeve plate. The first sliding plate will move upward under the action of the negative pressure. During the upward movement of the first sliding plate, the hydraulic oil in the second fixed housing will be sucked into the inside of the fixed sleeve plate through the liquid guide groove. The second fixed housing will suck out the hydraulic oil inside the third fixed housing through the second liquid guide pipe. The second sliding plate will move upward as the hydraulic oil is sucked out. During the upward movement of the second sliding plate, the air inside the fourth fixed housing will be sucked out through the gas guide pipe, thereby generating negative pressure inside the fourth fixed housing. At this time, the top plate is in the state of not being lifted, and the top plate in this state will press the adsorption sleeve into the inside of the fourth fixed housing, so that the first spring is in a compressed state. Also because of the action of the first spring, the top of the adsorption sleeve will be in close contact with the bottom of the top plate. Therefore, when negative pressure is generated inside the fourth fixed housing, the adsorption sleeve will adsorb the top plate. At the same time, as the air inside the fourth fixed housing is continuously sucked out, the adsorption sleeve will have a tendency to compress the first spring downward, thereby applying a downward pulling force to the top plate. This design can apply an initial downward pulling force to the top plate during the air extraction operation, making the seal between the top plate and the fixed sleeve plate complete. Furthermore, during the air extraction process of the top plate and the fixed sleeve plate, the negative pressure inside the fixed sleeve plate can be used to make the fixed sleeve plate and the top plate fit more tightly, preventing gaps between the fixed sleeve plate and the top plate through which external air may enter the inside of the fixed sleeve plate, affecting the purity of the extracted gas.

[0010] Preferably, the bottom of the first spring is fixedly connected to the bottom of the inner wall of the fourth fixed shell. A second fixed frame is fixedly connected to the top of the first sliding plate. A second spring is fixedly connected to the outer wall of the second fixed frame. The bottom of the second spring is fixedly connected to the inner wall of the fixed sleeve plate. A connecting rod is rotatably connected to the inner wall of the second fixed frame. A gas shielding plate is rotatably connected to the outer surface of the connecting rod. The outer surface of the gas shielding plate is slidably connected to the inner wall of the fixed sleeve plate. During the upward movement of the first sliding plate, it will also drive the second fixed frame to move upward and stretch the second spring. During the movement of the second fixed frame, it will drive the connecting rod to move together. During the movement of the connecting rod, it will pull the gas shielding plate towards the direction close to the second fixed frame, thereby exposing the air suction port opened on the fixed sleeve plate. At this time, the gas in the wellhead can be pumped out through this air suction port. When the air suction device fails or the high-pressure natural gas stored underground enters the wellhead, resulting in excessive air pressure inside the fixed sleeve plate, the first sliding plate will reset due to the relative high pressure, thereby blocking the above-mentioned air suction port again. When the air pressure in the fixed sleeve plate is in a normal negative pressure state, the air suction port will be exposed again. This design can automatically close the air suction port when the air suction device fails and causes excessive air pressure inside the fixed sleeve plate, preventing the sucked gas from being discharged back into the wellhead or leaking, or damaging the air suction device when the air pressure in the well is too high and causes excessive air pressure inside the fixed sleeve plate.

[0011] Preferably, a second winding spring is fixedly connected to the outer surface of the rotating fan. The end of the second winding spring away from the rotating fan is fixedly connected to the inner wall of the fixed frame. A limiting block is fixedly connected to the outer surface of the rotating fan. A moving rod is rotatably connected to the outer surface of the rotating fan. The outer surface of the moving rod is slidably connected to the inner wall of the fifth fixed shell. During the above process, the gas sucked by the air suction device will first enter the fifth fixed shell through the filtering action of the sliding filter plate and the fixed filter plate. The gas entering the fifth fixed shell will drive multiple rotating fans to rotate during the flowing process. During the rotation of the rotating fan, it will overcome the elastic force of the second winding spring. And when the rotating fan drives the limiting block to rotate to a certain angle, the limiting block will be blocked by the convex block on the inner wall of the fifth fixed shell, thereby preventing the rotating fan from rotating further. The corresponding two rotating fans will drive the moving rod to move together during the rotation process.

[0012] Preferably, a follower frame is slidably connected to the outer surface of the moving rod, the outer surface of the follower frame is slidably connected to the inner wall of the fifth fixed housing, a sliding filter plate is fixedly connected to the bottom of the follower frame, the outer surface of the sliding filter plate is slidably connected to the inner wall of the fifth fixed housing, a fixed filter plate is slidably connected to the top of the sliding filter plate, the outer surface of the fixed filter plate is fixedly connected to the inner wall of the fifth fixed housing, and the outer surface of the follower frame is slidably connected to the inner wall of the fixed filter plate. During the movement of the moving rod, the follower frame will be driven to move. During the movement of the follower frame, the sliding filter plate will be driven to move together. When the rotating fan cannot rotate, the sliding filter plate will also stop moving. At this time, only a small part of the filter holes opened on the sliding filter plate will intersect with the filter holes opened on the fixed filter plate. At this time, the sucked gas can only enter the interior of the fifth fixed housing through the intersecting part, and the sucked gas can be filtered through the intersecting part. When the suction stops, the second torsion spring will drive the rotating fan to reset, and then drive the sliding filter plate to reset. During the reset process, the intersecting area of the filter holes of the sliding filter plate and the fixed filter plate will increase, so that the particles filtered out and stuck between the sliding filter plate and the fixed filter plate during the previous air extraction process will fall off. This design can filter the extracted gas, thereby improving its purity. At the same time, after the air extraction is completed, the particles previously stuck between the sliding filter plate and the fixed filter plate will fall off due to the reset of the sliding filter plate, thereby realizing automatic cleaning and preventing blockage.

[0013] A usage method of a fracturing gas production wellhead with a sealing mechanism includes the following steps:

[0014] S1: When using this device, first install this device at a designated position, and then lift the top plate upward. After the fracturing work is completed and the fracturing equipment is taken out, the rotating ring can be rotated to reset the top plate, thereby sealing the wellhead.

[0015] S2: When natural gas needs to be extracted, install the suction device above the top plate. During extraction, the negative pressure can be used to make the fixed sleeve plate tightly adhere to the top plate. When the air pressure in the fixed sleeve plate is too high, the suction port will automatically close.

[0016] S3: The gas entering the fifth fixed housing will drive multiple rotating fans to rotate during the flowing process, and then drive the sliding filter plate to move together. When the suction stops, the sliding filter plate will reset.

[0017] The present invention has the following beneficial effects:

[0018] The gas sucked out by the suction device of the present invention will first enter the fixed housing five through the filtering action of the sliding filter plate and the fixed filter plate. The gas entering the fixed housing five will drive a plurality of rotating fans to rotate during the flowing process. When the rotating fans rotate, they will overcome the elastic force of the second coil spring. And when the rotating fans drive the limiting block to rotate to a certain angle, the limiting block will be blocked by the convex block on the inner wall of the fixed housing five, so that the rotating fans can no longer rotate. The corresponding two rotating fans will drive the moving rod to move together during the rotation process. The moving rod will drive the follower frame to move during the moving process. The follower frame will drive the sliding filter plate to move together during the moving process. When the rotating fans cannot rotate, the sliding filter plate will also stop moving. At this time, only a small part of the filter holes opened on the sliding filter plate will intersect with the filter holes opened on the fixed filter plate. At this time, the sucked gas can only enter the interior of the fixed housing five through this intersecting part and be filtered through this intersecting part. When the suction is no longer carried out, the second coil spring will drive the rotating fans to reset, and then drive the sliding filter plate to reset. During the reset process, the intersecting area of the filter holes of the sliding filter plate and the fixed filter plate will increase, so that the particles filtered out and stuck between the sliding filter plate and the fixed filter plate during the previous air extraction process will fall off. This design can filter the extracted gas and improve its purity. At the same time, after the air extraction is completed, the particles previously stuck between the sliding filter plate and the fixed filter plate will fall off due to the reset of the sliding filter plate, thus realizing automatic cleaning and preventing blockage.

[0019] When the present invention needs to extend the fracturing equipment into the wellhead, the top plate can be jacked up. The top plate in the figure is already in the jacked-up state, and the rotating ring is rotated so that its top contacts the bottom of the sliding rod after being jacked up, so that the top plate maintains the jacked-up state. The top plate will drive the fixed frame one to move upward during the upward movement process. The fixed frame one will suck the hydraulic oil in the first liquid guide pipe into the fixed housing one during the upward movement process. The first liquid guide pipe will suck the hydraulic oil in the gas guide block into the first liquid guide pipe, and then suck the two sliding rods in the direction away from each other. The sliding rods will drive the sealing plate to move together during the movement process, so that the feeding port can be exposed. At this time, the fracturing equipment can be passed through the feeding port through the fixed sleeve plate and extended into the wellhead. After the fracturing work is completed and the fracturing equipment is taken out, the rotating ring can be rotated so that it no longer supports the sliding rod. The top plate will fall back to its original position due to gravity, and the fixed frame one will also reset, so the sealing plate will also reset, thus sealing the wellhead. The rotating ring can be continuously rotated so that part of the clamping rod is inserted into the sliding rod to limit the sliding rod and the top plate. This design can maintain the stability of the downhole environment when the device is not in use through the sealing action of the sealing plate, prevent substances outside the well from entering the well, and the operation is simple and convenient.

[0020] When the natural gas is to be extracted in the present invention, the air suction device is installed above the top plate, and the rotating ring is rotated so that the clamping rod completely penetrates through the sliding rod. At this time, the clamping plate no longer limits the position of the limiting rod. The air suction device is started, and negative pressure will be generated inside the fixed sleeve plate. The first sliding plate will move upward under the action of the negative pressure. During the upward movement of the first sliding plate, the hydraulic oil in the second fixed housing will be sucked into the fixed sleeve plate through the liquid guide groove. The second fixed housing will suck out the hydraulic oil inside the third fixed housing through the second liquid guide pipe. The second sliding plate will move upward as the hydraulic oil is sucked out. During the upward movement of the second sliding plate, the air inside the fourth fixed housing will be sucked out through the air guide pipe, thereby generating negative pressure inside the fourth fixed housing. At this time, the top plate is in the state of not being lifted, and the top plate in this state will press the adsorption sleeve into the fourth fixed housing, so that the first spring is in a compressed state. Also due to the action of the first spring, the top of the adsorption sleeve will be in close contact with the bottom of the top plate. Therefore, when negative pressure is generated inside the fourth fixed housing, the adsorption sleeve will adsorb the top plate. At the same time, as the air inside the fourth fixed housing is continuously sucked out, the adsorption sleeve will have a tendency to compress the first spring downward, thereby applying a downward pulling force to the top plate. This design can apply an initial downward pulling force to the top plate during the air extraction operation, making the seal between the top plate and the fixed sleeve plate complete. Furthermore, during the air extraction process of the top plate and the fixed sleeve plate, the negative pressure inside the fixed sleeve plate can be used to make the fixed sleeve plate and the top plate fit more tightly, preventing gaps between the fixed sleeve plate and the top plate, and preventing external air from entering the fixed sleeve plate through the gaps, which affects the purity of the extracted gas.

[0021] During the upward movement of the first sliding plate in the present invention, it will also drive the second fixing frame to move upward together and stretch the second spring. During the movement of the second fixing frame, it will drive the first connecting rod to move. During the movement of the first connecting rod, it will pull the air shielding plate towards the direction close to the second fixing frame, thereby exposing the air suction port opened on the fixed sleeve plate. At this time, the gas in the wellhead can be extracted through this air suction port. When the air suction device fails or the high-pressure natural gas stored underground enters the wellhead, resulting in excessive air pressure inside the fixed sleeve plate, the first sliding plate will reset due to the relatively high pressure, thereby blocking the above-mentioned air suction port again. When the air pressure in the fixed sleeve plate is in the normal negative pressure state, the air suction port will be exposed again. This design can automatically close the air suction port when the air suction device fails and causes excessive air pressure inside the fixed sleeve plate, preventing the extracted gas from being discharged back into the wellhead or leaking, or preventing damage to the air suction device when the air pressure in the well is too high and causes excessive air pressure inside the fixed sleeve plate. Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 Schematic internal sectional structure diagram of the fixed sleeve plate of the present invention;

[0024] Figure 2 Schematic overall structure diagram of the fixed sleeve plate of the present invention;

[0025] Figure 3 Schematic overall structure diagram of the swivel ring of the present invention;

[0026] Figure 4 Schematic overall structure diagram of the first fixing bracket of the present invention;

[0027] Figure 5 Schematic overall structure diagram of the first sliding plate of the present invention;

[0028] Figure 6 Schematic overall structure diagram of the second sliding plate of the present invention;

[0029] Figure 7 For the present invention Figure 6 Enlarged structure diagram of A in;

[0030] Figure 8 Schematic overall structure diagram of the air shielding plate of the present invention;

[0031] Figure 9 Schematic internal sectional structure diagram of the fifth fixed shell of the present invention;

[0032] Figure 10 Schematic working process diagram of the present invention.

[0033] In the drawings, the list of components represented by each reference numeral is as follows:

[0034] In the figure: 1. Sealing assembly; 101. Wellhead; 102. Fixed sleeve plate; 103. Sliding rod; 104. Top plate; 105. Swivel ring; 106. Clamping rod; 107. First coil spring; 108. Clamping plate; 109. First fixing bracket; 110. First fixed housing; 111. First liquid guide pipe; 112. Liquid guide block; 113. Slide bar; 114. Sealing plate; 2. Air suction assembly; 201. First sliding plate; 202. Liquid guide groove; 203. Second fixed housing; 204. Second liquid guide pipe; 205. Third fixed housing; 206. Second sliding plate; 207. Limit rod; 208. Air guide pipe; 209. Fourth fixed housing; 210. Adsorption sleeve; 211. First spring; 212. Second fixing bracket; 213. Second spring; 214. Connecting rod; 215. Air shielding plate; 3. Filtration assembly; 301. Fifth fixed housing; 302. Fixing bracket; 303. Rotating fan; 3031. Second coil spring; 3032. Limit block; 304. Moving rod; 305. Follow-up frame; 306. Sliding filter plate; 307. Fixed filter plate. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Example 1, please refer to Figure 1 - Figure 4 , the present invention is a fracturing gas production wellhead with a sealing mechanism, including a sealing assembly 1. The sealing assembly 1 includes a wellhead 101, and a fixed sleeve plate 102 is fixedly connected to the outer wall of the wellhead 101. A sliding rod 103 is slidably connected to the inner wall of the fixed sleeve plate 102;

[0037] An air suction assembly 2. The air suction assembly 2 includes a first sliding plate 201 slidably connected to the inner wall of the fixed sleeve plate 102. A liquid guide groove 202 is formed inside the fixed sleeve plate 102, and a second fixed housing 203 is fixedly connected to the outer wall of the fixed sleeve plate 102;

[0038] A filtration assembly 3. The filtration assembly 3 includes a fifth fixed housing 301 fixedly connected to the bottom of the fixed sleeve plate 102. A fixing bracket 302 is fixedly connected to the inner wall of the fifth fixed housing 301, and a rotating fan 303 is rotatably connected to the inner wall of the fixing bracket 302.

[0039] A top plate 104 is fixedly connected to the top of the sliding rod 103. A rotating ring 105 is rotatably connected to the inner wall of the fixed sleeve plate 102. A clamping rod 106 is rotatably connected to the rotating ring 105. A first coil spring 107 is fixedly connected to the outer wall of the clamping rod 106. One end of the first coil spring 107 away from the clamping rod 106 is fixedly connected to the inner wall of the rotating ring 105. A clamping plate 108 is fixedly connected to the outer wall of the rotating ring 105. A first fixing frame 109 is fixedly connected to the bottom of the top plate 104. A first fixed shell 110 is slidably connected to the outer surface of the first fixing frame 109. When using this device, first install this device at a designated position. Subsequently, when the fracturing equipment is to be inserted into the wellhead 101, the top plate 104 can be jacked upward. The top plate 104 in the figure is already in the jacked state, and the rotating ring 105 is rotated so that its top contacts the bottom of the sliding rod 103 after being jacked up, thereby keeping the top plate 104 in the jacked state.

[0040] The outer wall of the first fixed shell 110 is fixedly connected to the inner wall of the fixed sleeve plate 102. A first liquid guide pipe 111 is fixedly connected to the inner wall of the fixed sleeve plate 102. Two air guide blocks 112 are respectively fixedly connected to the outer wall of the first liquid guide pipe 111. The outer surface of the air guide block 112 is fixedly connected to the inner wall of the fixed sleeve plate 102. A sliding rod 113 is slidably connected to the inner wall of the air guide block 112. Sealing plates 114 are fixedly connected to the ends of the two sliding rods 113 close to each other. The outer surface of the sealing plate 114 is slidably connected to the inner wall of the fixed sleeve plate 102. During the upward movement of the top plate 104, the first fixing frame 109 will be driven to move upward together. During the upward movement of the first fixing frame 109, the hydraulic oil in the first liquid guide pipe 111 will be sucked into the first fixed shell 110, and the first liquid guide pipe 111 will suck the hydraulic oil in the air guide block 112 into the first liquid guide pipe 111, thereby sucking the two sliding rods 113 in the direction away from each other. The sliding rod 113 will drive the sealing plate 114 to move together during the movement, thereby exposing the feeding port. At this time, the fracturing equipment can pass through the fixed sleeve plate 102 through the feeding port and then extend into the wellhead 101. After the fracturing work is completed and the fracturing equipment is taken out, the rotating ring 105 can be rotated so that it no longer supports the sliding rod 103. The top plate 104 will fall and reset due to gravity, and the first fixing frame 109 will also reset, so the sealing plate 114 will also reset, thereby sealing the wellhead 101. The rotating ring 105 can be continuously rotated so that a part of the clamping rod 106 is inserted into the sliding rod 103, thereby limiting the sliding rod 103 and the top plate 104. This design can maintain the stability of the underground environment when this device is not in use through the sealing function of the sealing plate 114, and can prevent substances outside the well from entering the well, and the operation is simple and convenient.

[0041] Example two, please refer to Figure 5 - Figure 10, the present invention is a fracturing gas production wellhead with a sealing mechanism. On the basis of Example 1, a second liquid guide pipe 204 is fixedly connected to the outer wall of the second fixed shell 203. One end of the second liquid guide pipe 204 far from the second fixed shell 203 is fixedly connected to a third fixed shell 205. The outer surface of the third fixed shell 205 is fixedly connected to the outer wall of the fixed sleeve plate 102. A second sliding plate 206 is slidably connected to the inner wall of the third fixed shell 205. A limiting rod 207 is fixedly connected to the bottom of the second sliding plate 206. The outer surface of the limiting rod 207 is slidably connected to the inner wall of the third fixed shell 205. The outer surface of the limiting rod 207 is slidably connected to the outer surface of the clamping plate 108. A gas guide pipe 208 is fixedly connected to the bottom of the third fixed shell 205. One end of the gas guide pipe 208 far from the third fixed shell 205 is fixedly connected to a fourth fixed shell 209. The outer surface of the fourth fixed shell 209 is fixedly connected to the outer wall of the fixed sleeve plate 102. An adsorption sleeve 210 is slidably connected to the inner wall of the fourth fixed shell 209. A first spring 211 is fixedly connected to the bottom of the adsorption sleeve 210. When extracting natural gas, install the suction device above the top plate 104 and rotate the rotating ring 105 so that the clamping rod 106 completely penetrates the sliding rod 103. At this time, the clamping plate 108 no longer limits the limiting rod 207. Start the suction device. A negative pressure will be generated inside the fixed sleeve plate 102. The first sliding plate 201 will move upward under the action of the negative pressure. During the upward movement of the first sliding plate 201, the hydraulic oil in the second fixed shell 203 will be sucked into the fixed sleeve plate 102 through the liquid guide groove 202. The second fixed shell 203 will suck out the hydraulic oil inside the third fixed shell 205 through the second liquid guide pipe 204. The second sliding plate 206 will move upward as the hydraulic oil is sucked out. During the upward movement of the second sliding plate 206, the air in the fourth fixed shell 209 will be sucked out through the gas guide pipe 208, thereby generating a negative pressure in the fourth fixed shell 209. At this time, the top plate 104 is in the non-lifted state, and the top plate 104 in this state will press the adsorption sleeve 210 into the fourth fixed shell 209, thereby making the first spring 211 in a compressed state. Also because of the action of the first spring 211, the top of the adsorption sleeve 210 will be in close contact with the bottom of the top plate 104. Therefore, when a negative pressure is generated inside the fourth fixed shell 209, the adsorption sleeve 210 will adsorb the top plate 104. At the same time, as the air in the fourth fixed shell 209 is continuously sucked out, the adsorption sleeve 210 will have a tendency to compress the first spring 211 downward, thereby applying a downward pulling force to the top plate 104. This design can apply an initial downward pulling force to the top plate 104 during the air extraction operation, making the seal between the top plate 104 and the fixed sleeve plate 102 complete. Furthermore, during the air extraction process of the top plate 104 and the fixed sleeve plate 102, the negative pressure inside the fixed sleeve plate 102 can make the fixed sleeve plate 102 and the top plate 104 fit more tightly, preventing gaps between the fixed sleeve plate 102 and the top plate 104, which would cause external air to enter the fixed sleeve plate 102 through the gaps and affect the purity of the extracted gas.

[0042] The bottom of the first spring 211 is fixedly connected to the bottom of the inner wall of the fourth fixed shell 209. The top of the first sliding plate 201 is fixedly connected to the second fixed frame 212. The outer wall of the second fixed frame 212 is fixedly connected to the second spring 213. The bottom of the second spring 213 is fixedly connected to the inner wall of the fixed sleeve plate 102. The inner wall of the second fixed frame 212 is rotatably connected to the connecting rod 214. The outer surface of the connecting rod 214 is rotatably connected to the air shielding plate 215. The outer surface of the air shielding plate 215 is slidably connected to the inner wall of the fixed sleeve plate 102. During the upward movement of the first sliding plate 201, it will also drive the second fixed frame 212 to move upward together and stretch the second spring 213. During the movement of the second fixed frame 212, it will drive the connecting rod 214 to move together. During the movement of the connecting rod 214, it will pull the air shielding plate 215 towards the direction close to the second fixed frame 212, so as to expose the air suction port opened on the fixed sleeve plate 102. At this time, the gas in the wellhead 101 can be pumped out through this air suction port. When the air suction device fails or the high-pressure natural gas stored underground enters the wellhead 101, resulting in excessive air pressure inside the fixed sleeve plate 102, the first sliding plate 201 will reset due to the relative high pressure, so as to block the above-mentioned air suction port again. When the air pressure in the fixed sleeve plate 102 is in a normal negative pressure state, the air suction port will be exposed again. This design can automatically close the air suction port when the air suction device fails and causes excessive air pressure inside the fixed sleeve plate 102, preventing the sucked gas from returning and re-entering the wellhead 101 or leaking, or damaging the air suction device when the air pressure in the well is too high and causes excessive air pressure inside the fixed sleeve plate 102.

[0043] A second torsion spring 3031 is fixedly connected to the outer surface of the rotating fan 303. The end of the second torsion spring 3031 away from the rotating fan 303 is fixedly connected to the inner wall of the fixed frame 302. A limiting block 3032 is fixedly connected to the outer surface of the rotating fan 303. A moving rod 304 is rotatably connected to the outer surface of the rotating fan 303. The outer surface of the moving rod 304 is slidably connected to the inner wall of the fifth fixed shell 301. During the above process, the gas sucked by the air suction device will first enter the fifth fixed shell 301 through the filtering action of the sliding filter plate 306 and the fixed filter plate 307. The gas entering the fifth fixed shell 301 will drive multiple rotating fans 303 to rotate during the flowing process. During the rotation of the rotating fan 303, it will overcome the elastic force of the second torsion spring 3031. And when the rotating fan 303 drives the limiting block 3032 to rotate to a certain angle, the limiting block 3032 will be blocked by the convex block on the inner wall of the fifth fixed shell 301, so that the rotating fan 303 can no longer rotate. The corresponding two rotating fans 303 will drive the moving rod 304 to move together during the rotation.

[0044] A follower frame 305 is slidably connected to the outer surface of the moving rod 304. The outer surface of the follower frame 305 is slidably connected to the inner wall of the fixed housing five 301. A sliding filter plate 306 is fixedly connected to the bottom of the follower frame 305. The outer surface of the sliding filter plate 306 is slidably connected to the inner wall of the fixed housing five 301. A fixed filter plate 307 is slidably connected to the top of the sliding filter plate 306. The outer surface of the fixed filter plate 307 is fixedly connected to the inner wall of the fixed housing five 301. The outer surface of the follower frame 305 is slidably connected to the inner wall of the fixed filter plate 307. During the movement of the moving rod 304, the follower frame 305 will be driven to move. During the movement of the follower frame 305, the sliding filter plate 306 will be driven to move together. When the rotating fan 303 cannot rotate, the sliding filter plate 306 will also stop moving. At this time, only a small part of the filter holes opened on the sliding filter plate 306 will intersect with the filter holes opened on the fixed filter plate 307. At this time, the sucked gas can only enter the interior of the fixed housing five 301 through the intersecting part, and the sucked gas is filtered through the intersecting part. When the suction stops, the torsion spring two 3031 will drive the rotating fan 303 to reset, and then drive the sliding filter plate 306 to reset. During the reset process, the intersecting area of the filter holes of the sliding filter plate 306 and the fixed filter plate 307 will increase. As a result, during the previous air extraction process, the particles filtered out and stuck between the sliding filter plate 306 and the fixed filter plate 307 will fall off. This design can filter the extracted gas, thereby improving its purity. At the same time, after the air extraction is completed, the particles previously stuck between the sliding filter plate 306 and the fixed filter plate 307 will fall off due to the reset of the sliding filter plate 306, thereby realizing automatic cleaning and preventing blockage.

[0045] The usage method of this fracturing gas production wellhead includes the following steps:

[0046] S1: When using this device, first install this device at the designated position, and then lift the top plate 104 upward. After the fracturing work is completed and the fracturing equipment is removed, the rotating ring 105 can be rotated to reset the top plate 104, thereby sealing the wellhead 101.

[0047] S2: When extracting natural gas, install the suction device above the top plate 104. During extraction, the negative pressure can be used to make the fixed sleeve plate 102 tightly attached to the top plate 104. When the air pressure in the fixed sleeve plate 102 is too high, the suction port will automatically close.

[0048] S3: The gas entering the fixed housing five 301 will drive a plurality of rotating fans 303 to rotate during the flow process, and then drive the sliding filter plate 306 to move together. When the suction stops, the sliding filter plate 306 will reset.

[0049] A specific application of this embodiment is:

[0050] When using this device, first install the device at the designated position. Then, when the fracturing equipment is to be extended into the wellhead 101, the top plate 104 can be lifted upward. The top plate 104 in the figure has already been in the lifted state. Rotate the rotating ring 105 so that its top contacts the bottom of the sliding rod 103 after it has been lifted, thereby keeping the top plate 104 in the lifted state. During the upward movement of the top plate 104, the first fixing frame 109 will be driven to move upward together. During the upward movement of the first fixing frame 109, the hydraulic oil in the first liquid guide pipe 111 will be sucked into the first fixed housing 110. The first liquid guide pipe 111 will suck the hydraulic oil in the air guide block 112 into the first liquid guide pipe 111, and then the two sliding rods 113 can be sucked in the direction away from each other. While the sliding rods 113 are moving, they will drive the sealing plate 114 to move together, thereby exposing the feeding port. At this time, the fracturing equipment can pass through the fixed sleeve plate 102 through the feeding port and then extend into the wellhead 101. After the fracturing work is completed and the fracturing equipment is taken out, rotate the rotating ring 105 so that it no longer supports the sliding rod 103. The top plate 104 will fall back to its original position due to gravity, and the first fixing frame 109 will also return to its original position. Therefore, the sealing plate 114 will also return to its original position, thereby sealing the wellhead 101. The rotating ring 105 can be continuously rotated so that a part of the clamping rod 106 is inserted into the sliding rod 103, thereby limiting the sliding rod 103 and the top plate 104. This design can maintain the stability of the underground environment when the device is not in use through the sealing function of the sealing plate 114, prevent substances outside the well from entering the well, and is simple and convenient to operate;

[0051] When natural gas is to be extracted, an air suction device is installed above the top plate 104, and the rotating ring 105 is rotated so that the clamping rod 106 completely penetrates through the sliding rod 103. At this time, the clamping plate 108 no longer limits the limiting rod 207. The air suction device is started, and negative pressure will be generated inside the fixed sleeve plate 102. The first sliding plate 201 will move upward under the action of the negative pressure. During the upward movement of the first sliding plate 201, the hydraulic oil in the second fixed housing 203 will be sucked into the fixed sleeve plate 102 through the liquid guide groove 202. The second fixed housing 203 will suck out the hydraulic oil inside the third fixed housing 205 through the second liquid guide pipe 204. The second sliding plate 206 will move upward as the hydraulic oil is sucked out. During the upward movement of the second sliding plate 206, the air in the fourth fixed housing 209 will be sucked out through the air guide pipe 208, thereby generating negative pressure in the fourth fixed housing 209. At this time, the top plate 104 is in the state of not being lifted, and the top plate 104 in this state will press the adsorption sleeve 210 into the fourth fixed housing 209, so that the first spring 211 is in a compressed state. Also because of the action of the first spring 211, the top of the adsorption sleeve 210 will be in close contact with the bottom of the top plate 104. Therefore, when negative pressure is generated inside the fourth fixed housing 209, the adsorption sleeve 210 will adsorb the top plate 104. At the same time, as the air in the fourth fixed housing 209 continues to be sucked out, the adsorption sleeve 210 will have a tendency to compress the first spring 211 downward, thereby applying a downward pulling force to the top plate 104. This design can apply an initial downward pulling force to the top plate 104 during the air extraction operation, so that the top plate 104 and the fixed sleeve plate 102 are completely sealed. Furthermore, during the air extraction process of the top plate 104 and the fixed sleeve plate 102, the negative pressure inside the fixed sleeve plate 102 can make the fixed sleeve plate 102 and the top plate 104 fit more tightly, preventing gaps between the fixed sleeve plate 102 and the top plate 104, and preventing external air from entering the fixed sleeve plate 102 through the gaps, which affects the purity of the sucked gas;

[0052] During the upward movement of the first sliding plate 201, it will also drive the second fixing bracket 212 to move upward together and stretch the second spring 213. During the movement of the second fixing bracket 212, it will drive the connecting rod 214 to move together. During the movement of the connecting rod 214, it will pull the air shielding plate 215 towards the direction close to the second fixing bracket 212, thereby exposing the air suction port opened on the fixed sleeve plate 102. At this time, the gas in the wellhead 101 can be extracted through this air suction port. When the air suction device fails or the high-pressure natural gas stored underground enters the wellhead 101, resulting in excessive air pressure inside the fixed sleeve plate 102, the first sliding plate 201 will reset due to the relative high pressure, thereby blocking the above-mentioned air suction port again. When the air pressure in the fixed sleeve plate 102 is in a normal negative pressure state, the air suction port will be exposed again. This design can automatically close the air suction port when the air suction device fails and causes excessive air pressure in the fixed sleeve plate 102, preventing the sucked gas from being discharged back into the wellhead 101 or leaking, or damaging the air suction device when the air pressure in the well is too high and causes excessive air pressure inside the fixed sleeve plate 102;

[0053] During the above process, the gas sucked by the air suction device will first enter the fifth fixed shell 301 through the filtering action of the sliding filter plate 306 and the fixed filter plate 307. The gas entering the fifth fixed shell 301 will drive multiple rotating fans 303 to rotate during the flowing process. During the rotation of the rotating fans 303, they will overcome the elastic force of the second torsion spring 3031. And when the rotating fans 303 drive the limit blocks 3032 to rotate to a certain angle, the limit blocks 3032 will be blocked by the convex blocks on the inner wall of the fifth fixed shell 301, thereby making the rotating fans 303 unable to rotate anymore. The corresponding two rotating fans 303 will drive the moving rod 304 to move together during the rotation process. During the movement of the moving rod 304, it will drive the follower frame 305 to move. During the movement of the follower frame 305, it will drive the sliding filter plate 306 to move together. When the rotating fans 303 cannot rotate, the sliding filter plate 306 will also stop moving. At this time, only a small part of the filter holes opened on the sliding filter plate 306 will intersect with the filter holes opened on the fixed filter plate 307. At this time, the sucked gas can only enter the inside of the fifth fixed shell 301 through this intersecting part, and the sucked gas is filtered through this intersecting part. When the air suction stops, the second torsion spring 3031 will drive the rotating fans 303 to reset, thereby driving the sliding filter plate 306 to reset. During the reset process, the intersecting area of the filter holes of the sliding filter plate 306 and the fixed filter plate 307 will increase, thereby enabling the particles filtered out and stuck between the sliding filter plate 306 and the fixed filter plate 307 during the previous air extraction process to fall off. This design can filter the extracted gas, thereby improving its purity. At the same time, after the air extraction is completed, the particles previously stuck between the sliding filter plate 306 and the fixed filter plate 307 will fall off due to the reset of the sliding filter plate 306, thereby realizing automatic cleaning and preventing blockage.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A fracturing gas production wellhead with a sealing mechanism, comprising a sealing assembly (1), the sealing assembly (1) includes a wellhead (101), an outer wall of the wellhead (101) is fixedly connected with a fixed sleeve plate (102), and a sliding rod (103) is slidably connected to an inner wall of the fixed sleeve plate (102), characterized in that, It further includes: An air intake assembly (2), the air intake assembly (2) includes a first sliding plate (201) slidably connected to the inner wall of a fixed sleeve plate (102), a liquid guide groove (202) is formed inside the fixed sleeve plate (102), and a second fixed shell (203) is fixedly connected to the outer wall of the fixed sleeve plate (102); A filtering assembly (3), the filtering assembly (3) includes a fifth fixed shell (301) fixedly connected to the bottom of the fixed sleeve plate (102), a fixed frame (302) is fixedly connected to the inner wall of the fifth fixed shell (301), and a rotating fan (303) is rotatably connected to the inner wall of the fixed frame (302); The top of the sliding rod (103) is fixedly connected to a top plate (104), a rotating ring (105) is rotatably connected to the inner wall of the fixed sleeve plate (102), a first fixed frame (109) is fixedly connected to the bottom of the top plate (104), a first fixed shell (110) is slidably connected to the outer surface of the first fixed frame (109), a first liquid guide pipe (111) is fixedly connected to the inner wall of the fixed sleeve plate (102), and two air guide blocks (112) are respectively fixedly connected to the outer wall of the first liquid guide pipe (111); A sliding rod (113) is slidably connected to the inner wall of the air guide block (112), and a sealing plate (114) is fixedly connected to one end of the two sliding rods (113) close to each other; A second liquid guide pipe (204) is fixedly connected to the outer wall of the second fixed shell (203), a third fixed shell (205) is fixedly connected to the end of the second liquid guide pipe (204) away from the second fixed shell (203), the outer surface of the third fixed shell (205) is fixedly connected to the outer wall of the fixed sleeve plate (102), a second sliding plate (206) is slidably connected to the inner wall of the third fixed shell (205), a limiting rod (207) is fixedly connected to the bottom of the second sliding plate (206), the outer surface of the limiting rod (207) is slidably connected to the inner wall of the third fixed shell (205), the outer surface of the limiting rod (207) is slidably connected to the outer surface of a clamping plate (108), a gas guide pipe (208) is fixedly connected to the bottom of the third fixed shell (205), a fourth fixed shell (209) is fixedly connected to the end of the gas guide pipe (208) away from the third fixed shell (205), the outer surface of the fourth fixed shell (209) is fixedly connected to the outer wall of the fixed sleeve plate (102), an adsorption sleeve (210) is slidably connected to the inner wall of the fourth fixed shell (209), and a first spring (211) is fixedly connected to the bottom of the adsorption sleeve (210); The bottom of the first spring (211) is fixedly connected to the bottom of the inner wall of the fourth fixed shell (209), a second fixed frame (212) is fixedly connected to the top of the first sliding plate (201), a second spring (213) is fixedly connected to the outer wall of the second fixed frame (212), the bottom of the second spring (213) is fixedly connected to the inner wall of the fixed sleeve plate (102), a connecting rod (214) is rotatably connected to the inner wall of the second fixed frame (212), a gas shielding plate (215) is rotatably connected to the outer surface of the connecting rod (214), and the outer surface of the gas shielding plate (215) is slidably connected to the inner wall of the fixed sleeve plate (102).

2. The fracturing gas production wellhead with a sealing mechanism according to claim 1, characterized in that: A clamping rod (106) is rotatably connected to the swivel ring (105). One end of a first coil spring (107) is fixedly connected to the outer wall of the clamping rod (106), and the other end of the first coil spring (107) is fixedly connected to the inner wall of the swivel ring (105) away from the clamping rod (106). A clamping plate (108) is fixedly connected to the outer wall of the swivel ring (105).

3. The fracking gas production wellhead with a sealing mechanism according to claim 2, characterized in that: The outer wall of the first fixed housing (110) is fixedly connected to the inner wall of the fixed sleeve plate (102). The outer surface of the air guide block (112) is fixedly connected to the inner wall of the fixed sleeve plate (102). The outer surface of the sealing plate (114) is slidably connected to the inner wall of the fixed sleeve plate (102).

4. The fracturing gas production wellhead with a sealing mechanism according to claim 3, wherein: One end of a second coil spring (3031) is fixedly connected to the outer surface of the rotating fan (303), and the other end of the second coil spring (3031) is fixedly connected to the inner wall of the fixed frame (302) away from the rotating fan (303). A limiting block (3032) is fixedly connected to the outer surface of the rotating fan (303). A moving rod (304) is rotatably connected to the outer surface of the rotating fan (303), and the outer surface of the moving rod (304) is slidably connected to the inner wall of the fifth fixed housing (301).

5. A fracturing gas production wellhead with a sealing mechanism according to claim 4, characterized in that: A follower frame (305) is slidably connected to the outer surface of the moving rod (304), and the outer surface of the follower frame (305) is slidably connected to the inner wall of the fifth fixed housing (301). A sliding filter plate (306) is fixedly connected to the bottom of the follower frame (305), and the outer surface of the sliding filter plate (306) is slidably connected to the inner wall of the fifth fixed housing (301). A fixed filter plate (307) is slidably connected to the top of the sliding filter plate (306), and the outer surface of the fixed filter plate (307) is fixedly connected to the inner wall of the fifth fixed housing (301). The outer surface of the follower frame (305) is slidably connected to the inner wall of the fixed filter plate (307).

6. A method for using a fracturing gas production wellhead with a sealing mechanism, adopting the fracturing gas production wellhead as described in claim 5, characterized in that, The method includes the following steps: S1: When using the device, first install the device at a specified position, then lift the top plate (104) upward. After the fracturing work is completed and the fracturing equipment is removed, rotate the swivel ring (105) to reset the top plate (104), thereby sealing the wellhead (101). S2: When extracting natural gas, install the suction device above the top plate (104). During extraction, use negative pressure to make the fixed sleeve plate (102) close to the top plate (104). When the air pressure in the fixed sleeve plate (102) is too high, the suction port will automatically close. S3: The gas flowing into the fifth fixed housing (301) will drive multiple rotating fans (303) to rotate during the flow process, thereby driving the sliding filter plate (306) to move together. When the suction stops, the sliding filter plate (306) will reset.

Images